17 St Helens Avenue, Swansea, SA1 4ND
About 17 St Helens Avenue
17 St Helens Avenue is a mid-terrace house in Swansea (SA1 4ND). It has a recorded floor area of 135 m² (around 1453 sq ft), construction records dating it to 1900-1929 and council tax band D. The latest certificate (September 2021) shows a D (score 57), a step below the typical UK home. The rating has held steady at D across 2 certificates since October 2009. Between certificates, roof efficiency dropped from Good to Very Poor. The recommended improvements would lift it to B (score 82), a 2-band jump.
Untraded for 17 years, with the last transfer in November 2009. That sale fell during the post-crash dip, which often skews comparisons against later neighbouring sales. Across 1997–2009, sale prices on this property compounded at 16.6% per year. Today's modelled estimate of £234,000 sits 56% above the 2009 sale of £150,000. One planning record on file: an extension approved in 2001. Past consents include an extension, meaningful when judging how the property has evolved.
Everything you need to know about 17 St Helens Avenue
The true value, the hidden risks and the full sale history, in one report.
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Energy performance
17 St Helens Avenue's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
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Level 3 Building Survey
Because the property was built before 1919 and has been extended more than once, we believe a Level 3 building survey should be considered.
From £885 · Includes VAT
Planning history
17 St Helens Avenue has an approved rear extension on the planning record.
1 application on record at 17 St Helens Avenue, Swansea, SA1 4ND
- Jun 2001ExtensionFullOutcome in report
Extension: Rear of property
Rear dormer extension
- Reference
- 2001/0580
Unlock 17 St Helens Avenue, Swansea, SA1 4ND's full planning history
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- Every decision — granted, refused or withdrawn (1 on record)
- All 1 application on this property in full, plus 44 notable nearby
- What the pattern means for extending or converting here
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Sales history & valuation
Price for 17 St Helens Avenue has grown more than fourfold since the 1997 starting point.
£234,000
Modelled from EPC, postcode comparables and a sale-price growth of 16.6% per year over 12 years.
£150,000
Growth on file: 16.6% per year over 12 years.
Sales timeline
27 November 2009Most recent
£150,000
+538.3%over 12 years30 October 1997
£23,500
Median price across the last 5 sales in SA1 4ND: £252,000 (2025–2020).
Nearby sales in SA1 4ND
Versus other St Helens Avenue homes
On floor area, 17 St Helens Avenue runs well behind the street norm.
Price per m²
£1,111
Street avg £1,128
Floor Area
135 m²
Street avg 151 m²
Habitable Rooms
6 rooms
Street avg 7 rooms
CO₂ Emissions
6.1 t/year
Street avg 7.0 t/year
Everything you need to know about 17 St Helens Avenue
The true value, the hidden risks and the full sale history, in one report.
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Similar properties nearby
The neighbourhood at a glance
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
St Helens Crescent — bus stop.
Go deeper on the local area
A Local Area report breaks down crime, transport links, schools and air quality in depth.